Notice to return defaulter u/s 46 for not filing return

Return is not filed by due date, Within 5 days from the due date , the Notice u/s 46 in form 3A is issued, requiring him to furnish return with 15 days . so in your case last date ifile your return will be 18/8/21

In case the return is still not furnished within 15days from said notice , the proper officer may proceed to asses the tax liability of said person & issue Order in the Form ASMT 13 under rule 100 & summary for demand in DRC 07 .
In case the defaulter furnishes a valid return within thirty days of the service of
assessment order in FORM GST ASMT-13, the said assessment order shall be
deemed to have been withdrawn in terms of provision of sub-section (2) of section 62
of the CGST Act. However, if the said return remains unfurnished within the statutory
period of 30 days from issuance of order in FORM ASMT-13, then proper officer
may initiate proceedings under section 78 and recovery under section 79 of the CGST
Act.

So in Short you have 5+15+30=50 days to furnish your return.

Your reply is not related to my doubt, sir in this case notice clearly state that GSTR 10 is required to file within 7 days, notice received on 03-08-2021, the when is last date of period 7 days , it will end on 09-08-2021 or 10-08-2021?

It will end on 09/08/21. both 3 and 9 are inclusive 3 4 5 6 7 8 9= 7days of notice

Dear Ajnas
will be 9/8/21.

Ok sir thanks, one more doubt this period calculation is same as is any type of notice from the GST Department? what about income tax notice?